Siding construction



March 1, 1966 c. R. NORMAN, JR 3,237,361

SIDING CONSTRUCTION United States Patent 3,237,361 SEEING CONSTRUCTION Charles R. Norman, J13, Glenview, Ill., assignor to United States Gypsum Company, Chicago, 111., a corporation of Illinois Filed June 18, 1963, Ser. No. 288,674 5 Claims. (Cl. 52-508) This invention pertains to a siding construction, and more particularly relates to exterior siding members having interlocking surface covering which are adapted to be secured to supporting framework in overlapping relation.

The use of overlapping wooden bevel siding is well known. Such siding, although attractive in appearance when employed for covering the exterior of various structures, possesses certain disadvantages. Most wooden siding must be painted at regular intervals for purposes of protecting the wood. In some instances the paint is ineffective in affording protection as when moisture is able to penetrate through the siding causing blistering cracking of the paint, as well as rotting of the wood.

The above disadvantages of wooden siding, coupled with substantially continuously increasing costs for such siding, have resulted in the development of various replacement materials. These materials have been employed in attempts to retain the pleasing bevel-siding visual effect while eliminating most of the disadvantages inherent in wood. Such replacement materials include metal siding, such as aluminum which has been precoated for desired appearance purposes. Semihardboard, dense, rigid, highly-sized insulation board, asbestos cement sheets, and granule-covered, asphalt-coated, saturated felt applied over a base material have also been employed.

A more recent development in wood-siding substitution comprises the use of plastics, many of which may be readily pigmented to provide desired colors and hues. Many plastics are also low in cost, weather resistant, requiring no painting, and free from splitting and other disadvantages inherent in wood. It has been found that a very serviceable siding may be produced by covering surface portions of a rigid boardlike product called backer board with a desired plastic sheet facing. The rigid backer board which comprises the siding core preferably is formed of materials of composition having insulating properties.

The plastic-faced backer board may be desirably arranged in overlapping relation to provide a pleasing bevel-siding appearance While concomitantly providing weather resistance and insulation properties. The plasticfaced backer board siding provided by this invention may be readily secured to framework in a novel manner so as to provide a most sturdy structure, as will hereinafter be made apparent.

It is an object of this invention, therefore, to provide a novel siding construction employing plastic facing having desirable wear and insulation properties.

It is another object of this invention to provide a novel plastic facing for a rigid siding core which facilitates securing of such siding to a supporting framework.

It is another object of this invention to provide an overlapping siding construction in which the siding members are highly resistant to blow off by wind.

It is a further object of this invention to provide a sturdy overlapping siding construction requiring a single transverse row of securing means, which are hidden from view, for fastening such siding to supporting framework members.

It is yet another object of this invention to provide plastic-faced siding which may be interlocked in overlapping relation and readily secured to a supporting framework.

The above and other objects of this invention will become more apparent from the following description when read in the light of the accompanying drawing and appended claims.

In one form of the siding provided by this invention, a rigid core of elongate boardlike configuration has secured to outer surface portions thereof a thin, weather-resistant plastic facing. The core may be formed of rigid materials, such as insulation board, gypsum board, plywood and inorganic fiber compositions suitable for forming into boardlike configuration. The plastic facing extends over the normally exposed, front surface portion of the core when the same is horizontally arranged in a position of use, as

well as an overlying, transverse, fastener-receiving portion spaced adjacent the core upper edge. The latter core transverse portion or fastener band comprises an elongate surface area through which nails or other securing means are driven in the process of fixing the siding in place on the supporting framework.

The siding of this invention is intended to be arranged in overlapping relation with the upper edge of each siding member abutted directly against a framework support surface. The lower end of each siding is outwardly disposed from the framework in overlapping relation with the upper edge portion of the immediately underlying siding member. Nails or other securing means are driven through the siding fastener band adjacent the siding upper edge; these nails do not engage the underlying siding member. Following nailing of a siding member in place, any force, such as .a driving .wind acting against the rear of the siding, is opposed and resisted by the securing means transversing the same.

The plastic facing of each siding member in addition to covering the normally exposed front surface portions and overlying fastener band has a front, outwardly-extending terminal flap portion which is bent over a contiguous facing portion so as to also overlie the siding fastener band. The front pendent flap portion is apertured at transverse intervals to allow passage of the nails or other means securing the siding to the framework. The apertured pendent flap is thus unaffected by the securing means normally used to secure the siding in place.

The facing extends around the lower edge of the core board and outwardly and upwardly projects from the rear core surface a short distance to form a detent flap. The rear flap in combination with the core board rear surface forms a pocket which may readily receive the pendent flap of an underlying siding in interlocking relationship prior to nailing the overlying siding in place. The interlocking flaps of the overlapping siding members assist the nails for other securing means in resisting any forces tending to remove the sidings from the framing, as will hereinafter be described in greater detail.

For a more complete understanding of this invention reference will now be made to the drawing wherein:

FIGURE 1 is a fragmentary perspective view of siding members made in accordance with the teachings of this invention arranged in overlapping relationship on a supporting framework;

FIG. 2 is a fragmentary transverse sectional view of a siding member made in accordance with the teachings of this invention;

FIG. 3 is a fragmentary perspective view, partially broken away, illustrating the external facing of the siding provided by this invention in assembled relationship with a core board with which normally employed.

FIG. 3a is an enlarged fragmentary view taken along line 3a-3a of FIG. 3 and illustrates the angular disposition of the pendent flap 22 relative to the remaining portion of the siding member;

FIG. 4 is a fragmentary sectional view taken on line 44 of FIG. 1 and illustrated on a scale enlarged thereover;

FIG. 4a is an enlarged fragmentary, sectional view illustrating an initial interlocking relationship assumed by the flap portions of the two siding members illustrated in FIG. 4 in the course of securing the upper siding members in place; and

FIG. 5 is a rear perspective view of a corner piece adapted to overlie corners defined by the illustrated siding.

Referring now more particularly to FIG. 1, a plurality of siding members are illustrated in overlapping relationship. The lower portions of all siding members (with the exception of that disposed lowermost) are arranged in overlapping relationship with upper portions of underlying siding members and with the inner upper terminal edges thereof in contact with supporting framework 12. The framework may comprise sheets of sheathing 14 secured to supporting 2 x 4 members or equivalent supporting members. Supporting framework 12 comprises no part of this invention and a framework of 2 x 4s or other vertical lumber pieces alone may be adequate to support the illustrated siding members 10.

Since the upper edge of each siding member 10 is disposed against the framework 12 and the lower portion of each siding member is in overlapped relationship with the upper portion of an underlying siding member, a pleasing bevel-siding appearance is presented. The bevelsiding visual effect is provided even though the members 10 have parallel faces.

It will be more clearly seen from FIG. 2 that each siding member 10 comprises a boardlike rigid core 16 which has a thin facing 18 secured to outer surface portions thereof. The boardlike core 16 is preferably an insulation board having a density of 25 pounds per cubic foot. For the normal building siding the core will be /8 inch in thickness and have a modulus of rupture of not less than about 350 pounds per square inch. Assuming that 8 inches of each siding member are to be exposed on the sidingouter face, each board is preferably 10 inches wide for such 8 inch exposure.

The boardlike core 16 should be sized and have good water resistance. Such properties may be obtained by the utilization of a rosin size and alum or by the use of asphaltic or resinous types of water-proofing materials during the formation of the board. A non-aliphatic solvent-soluble resin obtained during the manufacture of rosin sold under the trademark Vinsol by the Hercules Powder Company may be used to advantage as a sizing material for purposes of obtaining a core board.

A board of /2 inch thickness should have a density of at least about 20 pounds per cubic foot; a board of lesser thickness should be of greater density. For instance, a inch board should have a density of at least 22-30 pounds per cubic foot. Also suitable for purposes of functioning as a siding core are other boardlike products possessing the desired rigidi y, Such as gypsum board, semihardboard, hardboard, plywood, asbestos board, particle hoard, etc. The rigid core board 16, regardless of the material of composition, should have good strength, be substantially waterproof and capable of being nailed or otherwise secured in a ready manner to a supporting framework.

As will be seen from FIGS. 1 and 2, the continuous, stiff, weather-resistantsurfacing 18 extends from a point spaced adjacent the core board upper edge, over the normally exposed front surface of the core board, around the bottom edge of the board so as to terminate on the normally-hidden face of the core board in an upwardly projecting flap 20. The opposite terminal edge portion of facing 18 comprises a pendent flap 22, which overlies a fastener band portion 23 ofthe facing through which nails or equivalent means may be driven for purposes of securing the siding member to a supporting framework.

To facilitate the erection of the siding members 10 in overlapping relationship, as illustrated in FIG. 1, each pendent flap 22 is apertured at intervals to assure engagement with spaced vertical support members which are used in the supporting framework. Inasmuch as vertical supports are normally placed at 16 inch intervals, flap apertures 24 are preferably spaced at 1% inch intervals and the holes can be approximately inch long and 1 'inch wide so as to accommodate the passage of nails normally used in securing siding of the dimensions described to a supporting framework. If the nails are to be em bedded solely in the exterior sheathing 14 illustrated, care should be taken that the nails afford desired holding power. For functioning properly with the dimensions of the flap apertures presented, the heads of the nails employed should have a diameter of about .2 to .25 inch.

It is apparent from FIGS. 1 through 4 of the drawing that the apertured flap portions of each facing 18 are formed to allow a securing means, such as nail 26 illustrated in FIG. 4, to traverse the thickness of the rigid core 16, after first traversing a facing portion 28 preferably adhesively secured to the front, normally-exposed surface of the siding 10. Prior to penetrating an upper portion of the facing segment 28 which overlies the fastener band 23, the securing means will traverse an aperture'24 in the manner more clearly seen in FIG. 4 so as to leave the pendent flap 22 free to maintain its slight downward angular disposition. For a siding member which is about 10 inches wide, it is preferable that the securing means traverse the upper portion of the core board 16 along a fastener band having a centerline which is spaced approximately 1 /2 to 1% inches from the core board upper edge.

As above pointed out, the use of painted wood siding inherently possesses many disadvantages. Most woods rot when exposed to moisture and demand continual maintenance, such as may be elfected by the periodic use of paint. Quite often the paint itself is destroyed by moisture, leading to rotting of the then unprotected underlying wood.

By utilizing a facing 18 which is Weather-resistant, many of the disadvantages of wood and paint are eliminated. A thin facing 18 composed of rigid vinyl plastic, such as polyvinyl chloride plastic, made by the B. F. Goodrich Chemical Company and sold under the brand name Geon 82962, possesses excellent weather-resistance, may be processed to form facings in many attractive colors and is substantially maintenance free once a siding made therefrom has been erected in place. A vinyl facing should be at least .015 inch thick and preferably not less than .02 inch thick. Other plastics such as acrylics, possessing desired weather-resistance and ability to be shaped into the illustrated configuration, may of course be used.

It has been found that a single row of fastener means, such as nails 26, placed at regular intervals, preferably of 16 inches or less, so as to secure the siding members 10 to a supporting framework is adequate to maintain when assisted by the interlocking action of the detent the illustrated siding in a sturdy condition of assembly flap 20 of each upper siding member in engagement with the pendent flap 22- of each lower siding member.

In the normal course of assembly, a lower siding member is nailed to a supporting framework with the bottom edge portion outwardly disposed at a distance from the framework dictated by the thickness of the underlying siding member. Prior to nailing each siding to the supporting framework, the detent flap 20 of the upper siding member is inserted in a pocket, such as pocket 25 illustrated in FIG. 2, defined by pendent flap 22 and the immediately underlying portion of facing 18. Following the latter flap interlocking engagement, the upper siding member is nailed to the supporting framework in the manner illustrated in FIGS. 1 and 4. Obviously the lowermost siding member may efiect a desired beveled appearance by the use of a spacing strip, having the thickness of the siding, which outwardly spaces the lower end portion of such lowermost siding the desired distance from the framework. It should be noted that the novel flaps of the provided siding 18 provide a snug covering for the nails 26 after they have been driven in place. The protection afforded to nails 26 is apparent from FIG. 4 of the drawing.

It is also apparent from FIG. 4 that should a wind or other force attempt to pull the siding from the supporting framework, it must first overcome the retention force with which each siding member is retained to its supporting structure by the nails 26, as well as the interlocking action of the flaps 22 and 20. Thus, although a single transverse row of fasteners is employed with the provided siding members, because of the novel interlocking relationship between such members, great resistance to blowotf is provided resulting in a most sturdy structural arrangement. The novel interlocking flaps also provide an excellent seal against wind and water for the underlying framing structure.

As previously noted, it is preferable for a siding inches in width to have the centerline of its transverse fastener band spaced approximately 1 /2 to 1% inches from the upper siding terminal edge. Thus, approximately 85% of the facing side providing the normallyexposed surface is seen to be covered with the facing 18. The spacing between the fastener band and the siding edge enables the nails 26 to firmly secure each siding to the supporting framework while traversing a minimum of intermediate space, as seen in FIG. 4, and at the same time provides a siding bracing portion extending from the nails upwardly to the siding terminal edge which tends to prevent pivotal movement of the siding member about the nails as a fulcrum.

It will be seen in FIG. 1 that the corners defined by intersecting siding members may be covered by corner pieces 30, one of which is more clearly seen in FIG. 5. Each corner piece 30 is also preferably made of a highly weather-resistant material, such as vinyl plastic, and is adhesively secured to engage surface portions of the sidings or secured by nails, as at 32. Each piece 30 possesses spaced pocket portions 34 which are defined by upwardly extending flaps 35. Each flap 35 has a large outer portion 35:: and a small inner portion 35b formed integrally therewith. The reduced portions 35b are of such height as to assure non-engagement with the nails securing the underlying corner piece in place when each corner piece is assembled with the intersecting siding members.

The pockets 34 snugly receive the lower edge portions of the intersecting siding members and assist in providing a sturdy assembly in which the corner pieces are securely engaged with the siding members. It will be noted that upper central projection 39 of each corner piece 30 has the nail-receiving apertures 32 therein located at different levels to prevent engagement between two nails driven into the framing at right angles.

FIG. 3, in addition to illustrating apertures 24 disposed in the pendent flap 22, clearly discloses drain apertures 36 disposed at regular intervals along the length of the plastic facing portion 181), which is disposed about the lower edge surface of the core board 16. The drain apertures 36 prevent the accumulation of moisture in any facing-core board interval.

It will be further noted from FIG. 3 that the pendent and detent flaps 22 and 20, respectively, are each cut away at each end, at 31, a distance of about inch so as to permit overlapping of the facings, as when adjacent sidings are horizontally aligned. The reduced width of faces 3% defining projection 39 of each corner piece 39, see FIG. 5, enables the corner piece to extend upwardly beyond the shortened flap portions of the facings of the siding members engaged, as illustrated in FIG. 1, without engaging such flap portions.

Since the ends of the flaps 20 and 22 are removed, the facing 18 extends a short distance of about inch beyond both longitudinal terminal ends of the core board 16 to define projecting edges 18p. The projecting edges assist in the formation of a horizontal course of siding since one facing distal longitudinal edge portion 18p may function to align and interlock with an adjacent siding edge portion. Since the facings of each siding member are adhesively secured to the underlying core board surfaces, one projecting edge 18p must be cut from the remainder of the facing 18 with which formed if the core. boards of two adjacent siding members are to engage in a desired abutting edge-to-edge relationship. Thus, for each joint between two horizontally aligned siding members one facing edge portion 18p is preferably removed so that the remaining edge may efiiciently function to cover the inter-core board joint.

Upper edge portion 18e of each siding portion 18p is cut short of the fold juncture between the flap 22 and siding face portion 28 to prevent such projecting edge portion from hindering proper seating of the lower siding facing portion in enveloping relationship over a horizontally aligned siding member as the edge 18e is inserted beneath the pendent flap 22 of such aligned siding member.

Flap portions 22 and 26 for a siding 10 inches wide are approximately /2 to inch wide so as to provide for siding adjustability in the course of erecting the same in overlapping relationship. Manipulation of the facing pendent flaps 22 in the normal course of siding erection is facilitated by embossing a fold line 40 (see FIGS. 2 and 3) along the length thereof for purposes of outwardly disposing the lower portion of each fiap 22, thereby assuring ready grasping of the same in the course of facing interlocking. Detent flaps 20 may have similar distal longitudinal flap portions outwardly bent along an embossed fold line 40', as illustrated in FIGS. 2 and 3.

The foregoing dimensions have been presented by way of example only. For a 10 inch wide siding, the upper bracing siding portion may be as little as /2 inch or as great as 4 inches, although in the latter case it may be desirable to bevel the outer face to facilitate the interlocking of the detent flap of the upper siding with the pendent flap of the underlying siding. It is apparent that the greater the area of overlap, the farther out the lower portion of each siding member projects, thus hindering the interlocking action of the flap membe s. However, by using the provided dimensions as a guide, it will be possible to overlap siding members without the need for beveling the bracing portions of the siding.

The above-described siding may be applied in overlapping relationship on vertical and slanting surfaces, such as may be found on gables, although it is preferred to arrange the siding members horizontally.

Without further elaboration, the foregoing will so fully explain the character of my invention that others may, by applying current knowledge, readily adapt the same for use under varying conditions of service, while retaining certain features which may properly be said to constitute the essential items of novelty involved, which items are intended to be defined and secured to me by the following claims.

Iclaim:

1. A siding member comprising rigid core means having opposed main faces of substantially rectangular peripheral configuration, weather-resistant facing adhered to a portion of a main face of said core means disposed toward the normally-exposed face of said siding member; said facing having a first terminal flap connected to the facing portion adhered to said core means main face by means of a continuous reverse bend arranged substantially parallel to the longitudinal edges of said core means; said first flap extending exteriorly over said facing portion toward an opposite edge portion of said core means and having a plurality of spaced, fastener-receiving apertures disposed therein for permitting fasteners to pass completely therethrough to engage the face therebeneath and be free from said flap, said first flap defining a small acute angle with the adjacent facing portion with which integrally formed and being movable toward said core means to reduce said angle whereby said flap will be disposed nearly parallel to said main face when an overlying siding member is placed thereover; said facing also having a connecting portion extending over said opposite edge portion of said core means, and a second terminal flap contiguous with the connecting facing portion; said second flap extending toward the first terminal flap, outwardly from, and over the normally-hidden main face of said core means, said second terminal fiap extending from the normally-hidden face at a small acute angle to said normally-hidden face and being movable toward said core means.

2. A siding member comprising a rectangular, rigid core means having opposed main faces, a plastic facing adhered to one of the main faces of said core means, the adhered facing portion being contiguous with a first facing flap arranged at a small acute angle to the core means main face by means of a continuous reverse bend arranged substantially parallel to the longitudinal edges of said core means; said flap being movable toward said core means to reduce said angle whereby said flap will be disposed nearly parallel to said main face when an overlying siding member is placed thereover; said flap extending exteriorly over said adhered facing toward an opposed longitudinal edge of said core means and having a plurality of spaced, fastener-receiving apertures axially aligned substantially parallel to said longitudinal edges of said core means; said apertures permitting fasteners to pass completely through said flap to engage the facing there'beneath and be free from said flap; said adhered facing also being contiguous with a connecting facing portion extending about said opposed longitudinal edge of said core means, and terminating in a second flap extending from said connecting portion toward said first flap; said second flap extending outwardly from and over the second main face of said core means at a small acute angle and being movable toward said core means into substantially parallel relationship therewith; the distal longitudinal edge portions of said first and second facing fiaps being bent outwardly relative to the remainder of said flaps, away from the adjacent siding member surfaces.

3. A siding member comprising a rectangular rigid core means having opposed main faces, a plastic facing of L-shaped cross-sectional configuration extending over and adhered to a substantial portion of a first main face of said core means and a first longitudinal edge portion thereof; a first facing flap connected to said adhered facing by means of a continuous reverse bend disposed adjacent and parallel to a second longitudinal edge of said core means; said first flap extending exteriorly over said facing toward said first longitudinal edge portion and having spaced fastener-receiving apertures disposed therein for permitting fasteners to pass completely therethrough to engage the face therebeneath and be free from said flap; said apertures extending along an axis parallel to said reverse bend; said facing adhered to said first longitudinal edge portion of said core means being contiguous with a second facing flap projecting outwardly from and over the core means second main face in the direction of said core means second longitudinal edge portion and towards the first terminal flap; said first and second facing flaps defining small acute angles with the adjacent siding member surfaces and each one of said flaps being engageable with the other one of said flaps provided by an adjoining siding member in siding erection and readily movable toward said core means whereby said angles are reduced in the normal course of siding erection.

4. A siding member comprising rigid core means having opposed main faces of substantially rectangular peripheral configuration, a plastic facing having a portion thereof adhered to a major portion of a first main face of said core means; said facing terminating on said main face in a first flap connected to the remainder of said facing by means of a continuous reverse bend arranged substantially parallel to the longitudinal edges of said core means; said reverse bend being spaced from the nearer longitudinal edge; said first flap extending exteriorly over the adhered facing portion toward the farther longitudinal edge of said core means and having a plurality of axially aligned, fastener-receiving apertures for permitting fasteners to pass completely therethrough to engage the facing therebeneath and to be free from said flap; the interval between the aperture axis of alignment and said nearer longitudinal edge being at least 15 percent of the width of said core means; said flap defining a small acute angle with the adjacent, adhered facing portion; said flap being movable toward said core means to reduce said angle whereby said fiap will be disposed nearly parallel to said main face when an overlying siding member is placed thereover in the normal course of erection; said facing having a portion extending about the farther longitudinal edge of said core means and terminating in a second flap extending from said latter facing portion towards said first flap; said second flap extending outwardly at a small acute angle from the core means juncture of said farther longitudinal edge and the second main face of said core means and extending over said second main face; said second flap being movable toward said core means into substantially parallel relationship therewith in the normal course of siding erection.

5. A protective covering mounted on a supporting framework comprising at least two overlapping siding members having rigid cores and plastic, weather-resistant coverings having portions thereof defining downwardly disposed pendent flaps on the faces of the siding which are normally exposed; said pendent fiaps extending exteriorly over underlying portions of said coverings toward opposed edges of the cores over which disposed; said pendent flaps being apertured at spaced intervals for permitting fasteners to pass completely therethrough to engage the surfaces therebeneath and to be free from said flaps; detent flaps extending from the junctures of said opposed terminal edges of said cores and the normallyhidden siding member surfaces over said normally-hidden surfaces toward the pendent flaps; said detent flaps being formed integrally with said pendent flaps by means of connecting covering portions extending in part over said terminal edges; the pendent flap of the lower siding member being in interlocking sandwiched engagement within a pocket defined by the detent flap and an adjacent siding surface portion of the upper siding member; first securing means lying beneath the lower siding member pendent flap and engaging the covering portion beneath said flap and the core of said lower siding member and terminating in the supporting framework, said detent flap of the upper siding member lying directly over said securing means, and second securing means lying beneath the apertured pendent flap of the upper siding member and engaging a covering portion beneath said flap and the core of the upper siding member and terminating in the 9 10 framework; said second securing means concomitantly 2,766,861 10/1956 Abramson 52-531 urging said pendent flap of said lower siding member and 2,961,804 11/1960 Beck-man 52539 said detent flap of said upper siding member into tightly 2,991,592 7/1961 Rauen 52527 abutting, substantially parallel relationship. 3,001,332 9/1961 Wilder 52--303 5 References Cited by the Examiner FOREIGN PATENTS UNITED STATES PATENTS 615,200 2/1961 Canada.

2,213,519 9/1940 Faber 52394 2 5 03 9 1951 Anthony 52 544 EARL J- WITMER: Primary Examiner- 2,607,449 8/1952 Daniels. 10 

1. A SIDING MEMBER COMPRISING RIGID CORE MEANS HAVING OPPOSED MAIN FACES OF SUBSTANTIALLY RECTANGULAR PERIPHERAL CONFIGURATION, WEATHER-RESISTANT FACING ADHERED TO A PORTION OF A MAIN FACE OF SAID CORE MEANS DISPOSED TOWARD THE NORMALLY-EXPOSED FACE OF SAID SIDING MEMBER; SAID FACING HAVING A FIRST TERMINAL FLAP CONNECTED TO THE FACING PORTION ADHERED TO SAID CORE MEANS MAIN FACE BY MEANS OF A CONTINUOUS REVERSE BEND ARRANGED SUBSTANTIALLY PARALLEL TO THE LONGITUDINAL EDGES OF SAID CORE MEANS; SAID FIRST FLAP EXTENDING EXTERIORLY OVER SAID FACING PORTION TOWARD AN OPPOSITE EDGE PORTION OF SAID CORE MEANS AND HAVING A PLURALITY OF SPACED, FASTENER-RECEIVING APERTURES DISPOSED THEREIN FOR PERMITTING FASTENERS TO PASS COMPLETELY THERETHROUGH TO ENGAGE THE FACE THEREBENEATH AND BE FREE FROM SAID FLAP, SAID FIRST FLAP DEFINING A SMALL ACTUE ANGLE WITH THE ADJACENT FACING PORTION WITH WHICH INTEGRALLY FORMED AND BEING MOVABLE TOWARD SAID CORE MEANS TO REDUCE SAID ANGLE WHEREBY SAID FLAP WILL BE DISPOSED NEARLY PARALLEL TO SAID MAIN FACE WHEN AN OVERLYING SIDING MEMBER IS PLACED THEREOVER; SAID FACING ALSO HAVING A CONNECTING PORTION EXTENDING OVER SAID OPPOSITE EDGE PORTION OF SAID CORE MEANS, AND A SECOND TERMINAL FLAP CONTIGUOUS WITH THE CONNECTING FACING PORTION; SAID SECOND FLAP EXTENDING TOWARD THE FIRST TERMINAL FLAP, OUTWARDLY FROM, AND OVER THE NORMALLY-HIDDEN MAIN FACE OF SAID CORE MEANS, SAID SECOND TERMINAL FLAP EXTENDING FROM THE NORMALLY-HIDDEN FACE AT A SMALL ACUTE ANGLE TO SAID NORMALLY-HIDDEN FACE AND BEING MOVABLE TOWARD SAID CORE MEANS. 